Combining XRD and Raman spectroscopy techniques to probe the solid solution and composite forms of Pb1-xCoxTiO3 systems

Autor(es)

Cunha, T. R. ^[1] ; Rodrigues, A. D. ^[1] ; Rodrigues, J. E. ^[1] ; da Costa, R. C. ^[2] ; Toledo, T. A. ^[3] ; Pizani, P. S. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Fed Sao Carlos, Dept Phys, BR-13565905 Sao Carlos, SP - Brazil

^[2] Univ Fed Campina Grande, Dept Environm Engn, BR-58840000 Pombal - Brazil

^[3] Univ Fed Mato Grosso, Phys Inst, BR-78060900 Cuiaba - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Materials Research Bulletin; v. 107, p. 462-467, NOV 2018.
• Citações Web of Science: 3

Resumo

Raman scattering and XRD data allied to Rietveld refinement were used to investigate the structural and vibrational properties of Pb1-xCoxTiO3 samples with x ranging from 0.0 to 1.0. The results showed reductions in the tetragonallity factor and in the wavenumber of E(1TO) soft mode in the interval between x = 0.0 (c/a = 1.063 and E(1TO) = 89 cm(-1)) and x = 0.2 (c/a = 1.042 and E(1TO) = 81 cm(-1)). These parameters present a partial recovery for x > 0.4. Quantitative phase analyses combined with SEM indicate the formation of a solid solution for x less than 0.2 and composite formation of PbTiO3 and CoTiO3 for x higher than 0.2. From the temperature-induced softening of the E(1TO) mode, it was investigated the effect of the atomic substitution on the PbTiO3 Curie temperature, showing a minimum at 720 K (x similar to 0.4) compared to 763 K (x = 0). (AU)

• Processo FAPESP: 13/07793-6 - CEPIV - Centro de Ensino, Pesquisa e Inovação em Vidros
• Beneficiário: Edgar Dutra Zanotto
• Modalidade de apoio: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs